However, if that is not sufficient to be convincing, then I wish to produce a well authenticated denial of the most sweeping and convincing nature. John W. Rigdon, the son of Sidney Rigdon, has written a somewhat extended biography of his father which he has filed in its manuscript form in the Church Historian's Office at Salt Lake City. In this narrative he relates his own experience in connection with Mormonism, and his attempt to learn the truth from his father respecting the latter's early connection with the Book of Mormon. He tells of his visit to Utah, in 1863, where he spent the winter among the Mormon people. He was not favorably impressed with their religious life, and came to the conclusion that the Book of Mormon itself was a fraud. He determined in his own heart that if ever he returned home and found his father alive, he would try and find out what he knew of the origin of the Book of Mormon, "although," he adds, "he had never told but one story about it, and that was that Parley P. Pratt and Oliver Cowdery presented him with a bound volume of that book in the year 1830, while he [Sidney Rigdon] was preaching Campbellism at Mentor, Ohio." What John W. Rigdon claims to have seen in Utah, however, together with the fact that Sidney Rigdon had been charged with writing the Book of Mormon, made him suspicious, and he remarks: "I concluded I would make an investigation for my own satisfaction and find out if I could if he had all these years been deceiving his family and the world, by telling that which was not true, and I was in earnest about it. If Sidney Rigdon, my father, had thrown his life away by telling a falsehood and bringing sorrow and disgrace upon his family, I wanted to know it and was determined to find out the facts, no matter what the consequences might be. I reached home in the fall of 1865, found my father in good health and (he) was very much pleased to see me. As he had not heard anything from me for some time, he was afraid that I had been killed by the Indians. Shortly after I had arrived home, I went to my father's room; he was there and alone, and now was the time for me to commence my inquiries in regard to the origin of the Book of Mormon, and as to the truth of the Mormon religion. I told him what I had seen at Salt Lake City, and I said to him that what I had seen at Salt Lake had not impressed me very favorably toward the Mormon Church, and as to the origin of the Book of Mormon I had some doubts. 'You have been charged with writing that book and giving it to Joseph Smith to introduce to the world. You have always told me one story; that you never saw this book until it was presented to you by Parley P. Pratt and Oliver Cowdery; and all you ever knew of the origin of that book was what they told you and what Joseph Smith and the witnesses who claimed to have seen the plates had told you.